Segment Information (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Operating income (loss)
Gross profit	$ 228,726	$ 288,512	$ 587,511	$ 674,587
Assets elimination
Accounts receivable	799,025		799,025		$ 902,825
Other	83,283		83,283		97,529
Total assets	6,842,541	7,578,283	6,842,541	7,578,283	7,311,027
Liabilities elimination
Accounts payable	386,370		386,370		$ 511,056
Liabilities	3,886,756	4,540,294	3,886,756	4,540,294
Eliminations
Operating income (loss)
Gross profit	1,500	1,000	1,000	4,000
Assets elimination
Accounts receivable	(100,800)	(155,600)	(100,800)	(155,600)
Elimination of intra-company debt	(6,500)	(7,400)	(6,500)	(7,400)
Other	(6,600)	(8,800)	(6,600)	(8,800)
Total assets	(113,913)	(171,766)	(113,913)	(171,766)
Liabilities elimination
Accounts payable	(100,000)	(155,600)	(100,000)	(155,600)
Elimination of intra-company debt	(6,500)	(7,400)	(6,500)	(7,400)
Other	300	1,500	300	1,500
Liabilities	$ (106,164)	$ (161,510)	$ (106,164)	$ (161,510)